Correct Speed with bigger tires
JK Super Freak
Joined: Jul 2008
Posts: 1,103
Likes: 0
From: downingtown, PA
I don't know why anyone has to make it more complicated than that
JK Newbie
Joined: Mar 2009
Posts: 24
Likes: 0
From: San Jose, CA
Make it real simple, measure the height of the tire from the ground to the top of the tire. Put a level on the top of the tire and measure from ground to level and presto! Most calibrators are in 1/2" increments. If you can get it within 1/2" you will be A-OK.
For cheapy options you can go to AEV pro-call or Pro-Comp Accu-Pro. I think you are at $150 and $200 respectively.
The units measure tire diameter rather than circumference, you don't need to worry about Pi much. Check with GPS and be good.
For cheapy options you can go to AEV pro-call or Pro-Comp Accu-Pro. I think you are at $150 and $200 respectively.
The units measure tire diameter rather than circumference, you don't need to worry about Pi much. Check with GPS and be good.
JK Enthusiast
Joined: Mar 2009
Posts: 116
Likes: 0
From: Saint Louis, Missouri
I found this thread while doing a search to my question of "Will larger tires change the accuracy of my OEM GPS/NAV system (uConnect model # RER)?" Anyone know for sure? I was going to use the built in NAV to check speedo and milage when switching from factory 32s to bigger 35s and all this dawned on me (although I only have 60 miles on my new Rubicon so I haven't really had a chance to gauge what its baseline is).
JK Super Freak
Joined: Jul 2008
Posts: 1,103
Likes: 0
From: downingtown, PA
I found this thread while doing a search to my question of "Will larger tires change the accuracy of my OEM GPS/NAV system (uConnect model # RER)?" Anyone know for sure? I was going to use the built in NAV to check speedo and milage when switching from factory 32s to bigger 35s and all this dawned on me (although I only have 60 miles on my new Rubicon so I haven't really had a chance to gauge what its baseline is).
JK Enthusiast
Joined: Mar 2009
Posts: 116
Likes: 0
From: Saint Louis, Missouri
Yeah, I know. Just want to get her properly dressed up before taking her out to the big dance. Should be ready to go in about a week or so. Also wanting to keep the miles low on the stock rubber because I'll probably be selling them soon after the mods happen. Trust me, shell be getting plenty dirty 
Anyone here happen to know answers to question about built in GPS and larger tires?
Anyone here happen to know answers to question about built in GPS and larger tires?
JK Jedi
Joined: Feb 2008
Posts: 7,215
Likes: 10
From: Georgia
I found this thread while doing a search to my question of "Will larger tires change the accuracy of my OEM GPS/NAV system (uConnect model # RER)?" Anyone know for sure? I was going to use the built in NAV to check speedo and milage when switching from factory 32s to bigger 35s and all this dawned on me (although I only have 60 miles on my new Rubicon so I haven't really had a chance to gauge what its baseline is).
Thread Starter
JK Enthusiast
Joined: Jun 2008
Posts: 207
Likes: 0
From: Edison, NJ
MY GPS is ALL MESSED up now buy I think I installed the mygig L:ockpick not the tires but not too sure. all i know is I was on 8a NJ Turnpike and they told me I was in Staten Island NY